Discolouration On Tomatoes

[RocW]

I have grown some tomatoes in the garden (as opposed to in the greenhouse) and they have produced quite a lot of fruit. The last ones are ripening slowly but some of them appear discoloured on about the top third of the fruit. My wife suggested that this could be the result of the cold nights we have been having recently but that is just a guess. does anyone out there have any idea as to (a) what it is (b) what causes it and (c) whether it renders the fruit inedible?
Any answers gratefully received.

[Redhelen72]

Could be the cold nights but it could also be blight - the damp and the warmth days is a breeding ground from Blight -

https://www.bing.com/search?q=blight+on+tomatoes&cvid=e1a7c7b6ab7e4e4399b0d09228122b04&aqs=edge.6.69i57j0l8j69i11004.7543j0j1&pglt=41&FORM=ANNAB1&PC=U531&adlt=strict

[RocW]

RedHelen, many thanks for this. It looks very much like tomato blight so I'll dispose of the plants and fruit. I can't complain; I grew four plants from side shoots which I took from the greenhouse plants and I only tried it for fun. We've had a good crop from them.
Tahakazmi, I think you have the wrong number!

[Redhelen72]

If you can get any that have no discolouration then you can ripen them inside - just rinse them off and keep and eye on them.
My outside crop also got blight but I managed to rescue half the crop.

[youngmafbog]

I have some discolouration on the top part of my last San Marzano's Still edible, well we are eating them.

It's not really been cold here yet though.

[Old_Geezer]

All my tomato plants succumbed to late blight last year, so I didn't grow any this year. Hoping the soil will be clear now and that I can retry next year. Was particularly disappointed as until then the plants were much larger than I'd ever achieved previously, so I must have been doing something right.

[RocW]

Thanks to everyone who has taken the trouble to contribute. I've grown tomatoes in the greenhouse for many years but this is thefirst time evr that i tried them outside - and then, only really as an experiment. I'll salvage what I can and discard the affected parts. does this mean that the soil will stay infected for years? I grow all my crops in raised beds so I could try the tomatoes (I'd really like to try them again, armed with my experience from this year) in a different bed. if the blight remains in the soil, does it affect anything else? I don't grow potatoes but I will grow root vegetables, chard, spinach, fennel and salad crops including spring onions, radishes and salad leaves. Again, many thanks for all your replies. They are much appreciated.

[Redhelen72]

No blight does not remain in the soil, ensure you remove and don’t compost the blighted plants give the bed a good layer of compost and allow that to do its work and it will be fine for next year